EP1016532B1 - Selbstreinigende Tintenstrahldruckkopfpatronen - Google Patents

Selbstreinigende Tintenstrahldruckkopfpatronen Download PDF

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Publication number
EP1016532B1
EP1016532B1 EP99204316A EP99204316A EP1016532B1 EP 1016532 B1 EP1016532 B1 EP 1016532B1 EP 99204316 A EP99204316 A EP 99204316A EP 99204316 A EP99204316 A EP 99204316A EP 1016532 B1 EP1016532 B1 EP 1016532B1
Authority
EP
European Patent Office
Prior art keywords
orifice plate
ink
cleaning
ink jet
cartridge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99204316A
Other languages
English (en)
French (fr)
Other versions
EP1016532A3 (de
EP1016532A2 (de
Inventor
Edward P. C/O Eastman Kodak Company Furlani
Syamal K. C/O Eastman Kodak Company Ghosh
Dilip K. C/O Eastman Kodak Company Chatterjee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP1016532A2 publication Critical patent/EP1016532A2/de
Publication of EP1016532A3 publication Critical patent/EP1016532A3/de
Application granted granted Critical
Publication of EP1016532B1 publication Critical patent/EP1016532B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2002/16567—Cleaning of print head nozzles using ultrasonic or vibrating means

Definitions

  • This invention relates to an ink jet printer and more particularly to improved cleaning system for self cleaning ink jet printhead cartridges.
  • an ink jet printer has at least one printing cartridge from which droplets of ink are directed towards a receiver.
  • the ink may be contained in a plurality of channels and energy pulses are used to cause the droplets of ink to be ejected on demand or continuously, from nozzles or orifices in a plate in an orifice structure.
  • the energy pulses are generally provided by a set of electrical resistors, each located in a respective one of the channels, each one of them is individually addressable by current pulses to instantaneously heat and form a droplet or bubble in the channels which contact the resistors. Operation of thermal ink jet printer is described in details in US-A-4,849,774; US-A-4,500,895; and US-A-4,794,409.
  • a piezoelectric ink jet printing system includes a body of piezoelectric material defining a plurality of parallel open topped channels separated by walls.
  • the walls have metal electrodes on opposite sides thereof to form shear mode actuators for causing droplets to expel from the channels.
  • An orifice structure comprising at least one orifice plate defining the holes through which the ink droplets are ejected is bonded to the open end of the channels.
  • the electrical energy pulses are applied to the parallel electrodes causing the channels to shear actuating the expulsion of droplets from the orifice plate. Operation of piezoelectric ink jet print heads is described in details in US-A-5,598,196; US-A-5,311,218; and US-A-5,248,998 .
  • Inkjet printing cartridges whether it is of thermal or piezoelectric kind, use a variety of functional components, all of which must cooperate in a precise manner to achieve maximum efficiency.
  • One of the most important components is an orifice plate having a plurality of orifices or nozzles therein.
  • the nozzles are usually circular in cross section and the diameter of the nozzles may vary from 10 to 100 ⁇ m as required by the specification of the printer. Higher the resolution of the printed output, smaller is the ink droplet thereby requiring smaller diameter nozzles or orifices. Ink is ejected through these openings during printing operation.
  • the orifice plates and all the nozzles must be kept clean and free of debris and any kind of obstructions to ink flow at all times. If the orifice plate and nozzles are not clean, many problems can occur thereby undermining the performance of the printer. As for example, paper fibers and other debris accumulated on the orifice plate surface and inside the nozzles can affect the quality of the printed images. Similarly, debris can be dried ink crust and paper dust on the orifice plate as well as in the ink channels and the nozzles can cause the printer to perform poorly.
  • the foregoing problems are overcome, as described in US-A-5,300,958 by providing "maintenance or service stations" within the main printer unit.
  • the maintenance stations are designed such that when the printhead ink cartridge is not operating and is in a "parked” position, the cartridge is situated in the maintenance station outside the printing zone for the purpose of routine cleaning of the cartridges.
  • the maintenance station has many components, which are designed to serve many functions.
  • These functions include: (a) priming the printhead cartridge, (b) capping the orifice plate and nozzles (orifices) therein when the printhead is not in operation, (c) wiping contaminants from the orifice plate, (d) preventing ink from drying out in the openings of the orifice plate, and (e) providing a receptacle for discarding the cleaned debris.
  • US-A-5,103,244 discloses a structure in which a multi-blade wiper is used. The desired cleaning is performed by dragging a printhead (cartridge) across the selected wiper blade.
  • the wiper mechanism also includes a plurality of resilient blades each having an octagonal shape and rotatable about an axis.
  • FIG. 1 Another cleaning structure disclosed in US-A-5,300,958, includes a printhead wiper unit consisting of a single or dual members positioned against each other to form a capillary pathway therebetween.
  • the cartridge includes a compartment having an opening therethrough and an absorbent member impregnated with cleaning solution.
  • Still another cleaning structure is disclosed in US-A-5,574,485 which includes use of a high frequency ultrasonic liquid wiper wherein a cleaning nozzle is confrontingly aligned but spaced from printhead nozzles.
  • a cleaning solution is held within the cleaning nozzle by surface tension to form a meniscus and is caused to bulge toward into contact with the printhead nozzle face and form a bridge of cleaning solution therewith.
  • the cleaning solution is ultrasonically excited by a piezoelectric material immediately upstream of the cleaning nozzle to provide a high frequency energized liquid wiper to facilitate cleaning of clogged nozzles without having physical contact with the printhead nozzle face.
  • the European Patent EP 0 585 615 discloses an ink jet recording unit, which however does not use ultrasonic transducers or cleaning fluid.
  • the Japanese Patentapplication JP-A-58096563 shows an ink jet recording device with shows an ultrasonic wave vibrator which acts upon the orifice plate.
  • the ultrasonic transducer can be use with the cleaning fluid manifold arrangement of the invention.
  • an ink jet cartridge for an ink jet printer comprising:
  • the present invention provides an apparatus for cleaning an ink jet printhead cartridge which uses at least one actuable ultrasonic transducer embedded in an orifice plate of an ink jet cartridge.
  • a cap is brought in contact with the orifice plate rendering an air tight seal with orifice plate, and a stream of cleaning fluid is pumped over the orifice plate while energizing the embedded actuable ultrasonic transducers.
  • the maintenance station 100 incorporates self cleaning ink jet printhead cartridges 42, 44, 46, and 48 which are attached to a printhead carriage 10 which travels back and forth on a carriage rod 32 through the printing zone as shown by a directional arrow 20.
  • Printhead carriage 10 is moved bi-directionally typically by means of a drive belt (not shown) which is connected to a carriage motor (not shown).
  • Caps 52, 54, 56, and 58 are mounted rigidly on a movable platform 50.
  • the platform 50 can be made of metals like aluminum or steel or heavy duty plastics.
  • the platform 50 moves up or down as shown by a directional arrow 60.
  • ink jet printhead cartridges 42, 44, 46, and 48 are shown here to describe fully the embodiment of the present invention.
  • cartridge 42 utilizes black ink while cartridges 44, 46, and 48 can use only cyan, yellow, and magenta ink, respectively.
  • the cartridges 42, 44, 46, and 48 are each provided with an orifice structure that can define ink channels (see FIG. 2) but will necessarily include orifice structures 62, 64, 66, and 68 through which ink droplets are ejected to a receiver.
  • any number of different colored ink cartridges 42, 44, 46 and 48 could be used, as warranted by the application of the printer.
  • ink jet cartridges 42, 44, 46, and 48 are preferably piezoelectric ink jet printheads, but other kinds of cartridges, as for example, thermal cartridges may also be acceptable and useful in this invention.
  • ink jet cartridges 42, 44, 46, and 48 are provided with ink inlets 42a, 44a, 46a, and 48a for delivering the black, cyan, magenta and yellow ink to the ink jet cartridges 42, 44, 46, and 48, respectively.
  • Cleaning manifolds 61, 63, 65, and 67 corresponding to the ink jet cartridges 42, 44, 46, and 48, respectively are provided with cleaning fluid inlets 42b, 44b, 46b, and 48b, respectively and outlets (not shown) are also provided for circulating cleaning fluid through the orifice plate 40 by means of a pump 70.
  • Cleaning fluid conveyed through inlet tubes 41, 43, 45, and 47, is circulated back to the pump 70 through a filter 69 and by means of outlet tubes 51, 53, 55, and 57 as shown by arrows.
  • the maintenance station 100 of FIG. 1 will be understood by those skilled in the art to be located in a region outside the printing zone at one end of the bi-directional movement, shown by the arrow 20, of carriage 10. Cleaning is accomplished when the ink jet cartridges 42, 44, 46, 48 as they are moved by the carriage rod 32 until they enter the maintenance station 100 where they engage the caps 52, 54, 56, and 58 and are covered by such caps. Cleaning fluid is then introduced and actuable ultrasonic transducers 71, 73, and 75 are energized, as will be described later.
  • FIG. 2 an exploded view of the printhead cartridge 42 showing the details of the orifice structure 62 and cleaning manifold 61 along with actuable transducers 71, 73 and 75 which are embedded in the printhead base 80.
  • the printhead cartridge 42 includes several components, which are built individually and assembled together.
  • the orifice structure 62 includes a plastic or rubber gasket 30 which fits around the orifice plate 40, and is bonded to a printhead base 80.
  • the gasket 30 helps sealing the cap 120 (see FIG. 3) against the cartridge 42 so that the cartridge 42 remains water tight during the cleaning process.
  • the orifice plate 40 has several openings including at least one row of closely spaced orifices 79 for ejecting ink drops.
  • the diameter of the orifices 79 may vary from 10 to 100 ⁇ m.
  • the orifice plate 40 may be formed either by electroforming nickel or chemical etching or laser cutting metal sheets, such as aluminum, copper or stainless steel, and the exterior surface is coated with gold to reduce corrosion caused by chemically active species in ink.
  • the openings 72, 74, and 76 in the orifice plate 40 are provided to accommodate the embedded actuable transducers 71, 73, and 75 (see FIG. 3).
  • the openings, in the orifice plate 40 designated as inlet channel 77 and outlet channel 78, are provided for channeling the cleaning fluid into and out of the printhead base 80.
  • the printhead base 80 includes ink channels 82 and 84 made from piezoelectric ceramic such as lead-zirconate-titanate, and the actuable ultrasonic transducers 71, 73, and 75 (see FIG. 3).
  • the printhead base 80 is preferably made from alumina ceramic or alternatively from metals like aluminum or stainless steel.
  • a series of inlet tubes 85 are provided for the incoming cleaning fluid to be delivered across the orifice plate 40 for ultrasonic cleaning by energizing the actuable ultrasonic transducers 71, 73, and 75, and an outlet 88 is provide for the cleaning fluid to exit the cleaning manifold 61 through the cleaning fluid outlet 42c.
  • a series of tubes 85 for delivering a stream of cleaning fluid across the orifice plate 40 are aligned with holes 94 arranged in the cleaning fluid inlet manifold 90 which lead to cleaning fluid inlet 42b.
  • the cleaning fluid exits through first an outlet channel 78 arranged in the orifice plate 40, next through another outlet channel 88 arranged in the printhead base 80, and then finally through an outlet 42c which is provided in an outlet gutter 92 being located in the cleaning manifold 61.
  • the tubes 85 protrude through an inlet channel 77 located in the orifice plate 40 and are kept flushed with the top surface of the orifice plate 40.
  • the orifice structure 62 is mounted on the cleaning manifold 61, and those assembled are next bonded on to the ink reservoir 95.
  • FIG. 3 a partial view of the ink cartridge 42 in operative relationship with the cap 52 is shown.
  • the cap 52 engages the ink cartridge 42 and makes a watertight seal around the gasket 30.
  • the cleaning fluid is pumped through the inlet tube 41 to the orifice structure 62 and the actuable ultrasonic transducers 71, 73, and 75 are energized for 10 to 30 seconds to effectively clean the clogged orifices 79 and the ink channels 82 and 84 (see FIG. 2).
  • FIG. 4 a partial cross-sectional view of the ink cartridge 42 along the line 4-4 in FIG. 3 is shown.
  • the actuable ultrasonic transducers 71, 73, and 75 are embedded in the printer base 80 so that their top active surfaces are in the same plane as the top surface of the orifice plate 40.
  • the orifices 79 in the orifice plate 40 are aligned with the open ends of the ink channels 82 and 84 so that ink droplets are ejected from those ink channels as and when each channel is electronically addressed.

Landscapes

  • Ink Jet (AREA)

Claims (2)

  1. Tintenstrahlpatrone (10) für einen Tintenstrahldrucker mit:
    (a) einem Druckkopf (42, 44, 46, 48) mit einer eine Vielzahl von Öffnungen (62, 64, 66, 68) für den Tintenauswurf aufweisenden Lochplatte (40) sowie einem Fuß (80);
    (b) einer Patrone (10) zur Aufnahme eines Behälters (95) mit Tinte, die darauf ausgelegt ist, durch die Öffnungen (62, 64, 66, 68) ausgeworfen zu werden, wobei die Patrone eine Reinigungsrohrverzweigung (61, 63, 65, 67) umfasst mit einer Vielzahl von Eintrittsrohren (85) und einen Austrittskanal (78), durch den Reinigungsflüssigkeit leitbar ist, so dass diese Flüssigkeit über die Außenfläche der Lochplatte (40) gelenkt wird; und
    (c) einer Vielzahl betätigbarer Ultraschallwandler (71, 73, 75), die in dem Fuß (80) eingebettet und in Wirkbeziehung zur Lochplatte (40) angeordnet sind, und die bei Betätigung Ultraschallwellen erzeugen, die auf die Lochplatte (40) auftreffen, um Verunreinigungen zu lösen, wodurch die über die Oberfläche der Lochplatte (40) geleitete Reinigungsflüssigkeit die gelösten Verunreinigungen mitnimmt.
  2. Tintenstrahldruckvorrichtung zur Aufnahme einer Tintenstrahlpatrone (10) und zur Reinigung dieser Tintenstrahlpatrone (10), die folgendes umfasst:
    (a) die Tintenstrahlpatrone (10) mit:
    (i) einem Druckkopf (42, 44, 46, 48) mit einer eine Vielzahl von Öffnungen (62, 64, 66, 68) für den Tintenauswurf aufweisenden Lochplatte (40) sowie einem Fuß (80);
    (ii) einem Behälter (95) zur Aufnahme von Tinte, die darauf ausgelegt ist, durch die Öffnungen (62, 64, 66, 68) ausgeworfen zu werden; und
    (iii) einer Reinigungsrohrverzweigung (61, 63, 65, 67), die mit dem Tintenbehälter (95) verbunden ist und eine Vielzahl von Eintrittsrohren (85) umfasst sowie einen Austrittskanal (78), durch den Reinigungsflüssigkeit über die Außenfläche der Lochplatte (40) leitbar ist; und
    (b) eine Vielzahl betätigbarer Ultraschallwandler (71, 73, 75), die in dem Fuß (80) eingebettet und in Wirkbeziehung zur Lochplatte (40) angeordnet sind, und die bei Betätigung Ultraschallwellen erzeugen, die auf die Lochplatte (40) auftreffen, um Verunreinigungen zu lösen, wodurch die über die Oberfläche der Lochplatte (40) geleitete Reinigungsflüssigkeit die gelösten Verunreinigungen mitnimmt.
EP99204316A 1998-12-28 1999-12-15 Selbstreinigende Tintenstrahldruckkopfpatronen Expired - Lifetime EP1016532B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US221349 1998-12-28
US09/221,349 US6267464B1 (en) 1998-12-28 1998-12-28 Self cleaning ink jet printhead cartridges

Publications (3)

Publication Number Publication Date
EP1016532A2 EP1016532A2 (de) 2000-07-05
EP1016532A3 EP1016532A3 (de) 2000-07-19
EP1016532B1 true EP1016532B1 (de) 2002-08-07

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EP99204316A Expired - Lifetime EP1016532B1 (de) 1998-12-28 1999-12-15 Selbstreinigende Tintenstrahldruckkopfpatronen

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US (1) US6267464B1 (de)
EP (1) EP1016532B1 (de)
JP (1) JP2000218829A (de)
DE (1) DE69902435T2 (de)

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Also Published As

Publication number Publication date
DE69902435D1 (de) 2002-09-12
US6267464B1 (en) 2001-07-31
EP1016532A3 (de) 2000-07-19
JP2000218829A (ja) 2000-08-08
DE69902435T2 (de) 2003-05-15
EP1016532A2 (de) 2000-07-05

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